And mark these mother-truckers up, they are paying for the convenience... providing you aren't somehow preventing them from buying the stuff themselves beforehand (the way movie theaters do), it's not at all immoral. 

As for living in an illegal unit, I would really focus on whether this unit is nonconforming or illegal.

If you are an LLC, then if you use your personal credit card, you would then have to pay yourself from the LLC for what was purchased on the credit card, and you personally would need to provide your LLC with a receipt.  

Winner bidders pay the taxes each year unless and until there is a redemption. 

The government for my tenant is paying the full rent amount due to low income.

Find a property, develop it, live in it, rent it out and then repeat.Another approach, which I believe may have already been mentioned is to find a mixed use property in lieu of just focusing on a 3plexAnother approach is to find something near one of the universities and run your rental analysis as if you are renting by the room at dorm like prices in lieu of renting each unit individually. 

It may sound nice to pay a 6% management fee but the extra fees can add up to be more than the other company that charges 10% with no additional fees.

They didn't pay and left the place a mess, with plenty of belongings like beds, clothes, bikes, etc. 

He said it’s more of an incentive to get his tenants to pay on time.

I pay myself on a W2, I've submitted my tax returns and a bunch of other info to them, now they want to see the company's financial records.